CN111979475A - Wire rod for ultrahigh-strength steel strand and preparation method thereof - Google Patents
Wire rod for ultrahigh-strength steel strand and preparation method thereof Download PDFInfo
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- CN111979475A CN111979475A CN202010503561.9A CN202010503561A CN111979475A CN 111979475 A CN111979475 A CN 111979475A CN 202010503561 A CN202010503561 A CN 202010503561A CN 111979475 A CN111979475 A CN 111979475A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Abstract
The invention discloses a wire rod for an ultrahigh-strength steel strand and a preparation method thereof, and belongs to the technical field of smelting and rolling. The invention reasonably designs components and process parameters, wherein the chemical components comprise the following components in percentage by mass: c: 0.80% -0.95%, Si: 0.70% -1.00%, Mn: 0.50-0.90%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, V: 0.01-0.06%, Cr: 0.15 to 0.30 percent, the balance being Fe and inevitable impurities, the tensile strength Rm of the produced wire rod is 1350-1430MPa, the reduction of area Z is 25 to 35 percent, and the strength of the steel strand produced by the wire rod is greatly improved.
Description
Technical Field
The invention belongs to the technical field of smelting and rolling, and particularly relates to a wire rod for an ultrahigh-strength steel strand and a preparation method thereof.
Background
The prestressed steel strand is generally applied to the national economy fields of highways, railways, bridges, electric power, buildings, water conservancy, environmental protection and the like, and the annual demand is more than 350 million tons. The domestic application of the common prestressed material comprises various wires with the strength grades of 1570MPa, 1720MPa and 1860MPa, and the domestic highest strength grade is 1960 MPa. With the high-speed propulsion of construction projects such as expressways, railways, bridges and the like and the development of cable-supported bridges such as large-span cable-stayed bridges, suspension bridges and the like towards larger spans, the strength level of the existing prestressed steel strand cannot meet the bearing capacity of the large-span bridges, the steel strand with the higher strength level is used for replacing steel strands 1860MPa and 1960MPa, the span of a pier column of a frame pier of the railway bridge can be increased, the bearing capacity of a concrete member is improved, resources and energy are saved, the field configuration and tensioning operation are reduced, the construction period is shortened, the cost is reduced, and good economic benefit and social benefit are achieved.
Disclosure of Invention
Aiming at one or more problems in the prior art, one aspect of the invention provides a wire rod for an ultrahigh-strength steel strand, which comprises the following chemical components in percentage by mass: c: 0.80% -0.95%, Si: 0.70% -1.00%, Mn: 0.50-0.90%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, V: 0.01-0.06%, Cr: 0.15 to 0.30 percent, and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of the wire rod for the ultrahigh-strength steel strand, which comprises the following steps of: the method comprises the following steps of molten iron pretreatment, converter refining, VD vacuum treatment, continuous casting, cogging and rolling, wherein:
after the molten iron pretreatment process, Si in the molten iron: 0.3-0.7 percent of S, less than or equal to 0.015 percent of P, less than or equal to 0.120 percent of P, less than or equal to 0.10 percent of Ti and more than or equal to 1250 ℃ of T;
the converter process adopts top-bottom combined blowing for decarburization and dephosphorization, and the steel is smelted at 1650 ℃ until the carbon content in the molten steel is not less than 0.15 percent and the phosphorus content is less than 0.01 percent, the steel end point component C is not less than 0.15 percent, P is not more than 0.020 percent, S is not more than 0.015 percent, and T: 1610 to 1630 ℃;
in the VD vacuum treatment process, the VD vacuum degree is less than or equal to 0.10KPa, the target value is less than or equal to 0.06KPa, the deep vacuum time is more than or equal to 15min, a calcium-silicon wire is fed after vacuum breaking, and the soft blowing time is controlled by soft blowing for more than 15 min;
in the continuous casting process, the superheat degree is controlled to control the temperature of a first furnace 1 to be opened to be 35-55 ℃, the tundish temperature in the second furnace and the later furnace is controlled to be 20-30 ℃, the casting furnace 1 is opened to be cast at the pulling speed of 0.4m/min, and the constant pulling speed of the other furnaces is controlled to be cast at the target of 0.65 m/min;
in the rolling process, the heating temperature of the rolling heating furnace is controlled as follows: preheating at 700 + -20 deg.C, heating at 1100 + -20 deg.C, soaking at 1150 + -20 deg.C, controlling residual oxygen at 1% -4%, and heating for 105 + -5 min; the initial rolling temperature is 1020 +/-15 ℃, the finish rolling inlet temperature is 910 +/-20 ℃, the starting roller speed is 0.76m/s, the opening degrees of 1-6 fans are 100%, 7 fans are closed, the opening degrees of 8 fans are 50%, the opening degrees of 9-10 fans are 100%, and the heat-insulating cover is fully opened.
The preparation method of the wire rod for the ultra-high strength steel strand provided based on the technical scheme reasonably designs components and process parameters, the diameter of the produced wire rod is 14mm, the tensile strength Rm is 1350-1430MPa, the reduction of area Z is 25-35%, the strength grade of the steel strand produced by the wire rod is greater than 2000MPa grade, the highest strength can reach 2400MPa, and the strength of the existing steel strand is greatly improved, so that the span of the pier column of the railway bridge frame pier is increased, the bearing capacity of a concrete member is improved, resources and energy are saved, the field configuration and tensioning operation are reduced, the construction period is shortened, and the cost is reduced.
Detailed Description
The invention aims to provide a wire rod for an ultrahigh-strength steel strand and a preparation method thereof, which are used for improving the strength of the existing steel strand so as to increase the span of a pier column of a railway bridge frame pier, improve the bearing capacity of a concrete member, save resources and energy, reduce field configuration and tensioning operation, shorten the construction period and reduce the cost.
The invention firstly reasonably designs chemical components based on the following principles: c is a basic strengthening element in carbon steel, the strength can be improved by about 10MPa when the C is generally increased by 0.01 percent in high-carbon steel, but excessive C can promote center segregation in the continuous casting process, so that eutectoid cementite is precipitated in the controlled cooling process of a wire rod, even a reticular cementite is formed, the plasticity of the wire rod is reduced, and wire breakage in drawing is caused. In order to reduce the loss of heat of the strength of the wire rod during galvanizing or stabilizing treatment after wire drawing, high-carbon high-silicon can be adopted to improve the strength of the wire rod. In order to form stable carbide more easily, the permeability of the steel wire is improved through precipitation strengthening and solid solution strengthening, the tempering resistance of the steel wire is improved, the heat loss of the strength of the steel wire is reduced, and the high-strength steel strand adopts the method of increasing the content of Cr to ensure the strength of the wire rod. Or micro alloying elements such as V, Ti, Ni, B, Nb and the like can be added for microalloying, and the toughness of the wire rod is improved through the fine grain strengthening effect. Therefore, in the present invention, the C content is preferably controlled to 0.80% to 0.95% from the middle to lower limit. Si is a ferrite strengthening element, improves the ferrite strength through solid solution strengthening, and is used as a widely used deoxidizer, thereby being beneficial to reducing the oxygen content in steel and reducing inclusions. However, high Si causes decarburization of the material, prolongs the incubation period and the transformation time in the phase transformation process, and is not beneficial to control of the structure and the mechanical properties. Therefore, the Si content in the present invention is preferably 0.70% to 1.00%. Mn is used as an austenite stabilizing element and can increase the strength of steel and reduce the phase transition temperature, but too high Mn content can cause the segregation of central alloy elements of a continuous casting billet, obviously increase the hardenability of the central part of a wire rod, cause the generation of central part quenching tissues in the cooling control process and cause the wire rod to be drawn and broken. In addition, the Mn content is preferably controlled to be 0.50-0.90% in the invention by combining with the optimization of the controlled cooling process. Cr is a common medium-strength carbide forming element in high-carbon steel, can improve the stability of austenite and prevent the growth of crystal grains during hot rolling; the nucleation and growth of carbide are delayed, the continuous cooling transformation curve of steel moves towards the lower right, and the interlayer spacing of pearlite plates is refined, so that the strength of the wire rod is obviously improved, but the quenching structure is easily generated in the cooling control process due to high Cr content. Therefore, the Cr content in the present invention is preferably 0.15% to 0.30%. V can improve the strength and toughness of the wire rod by refining grains, so that the preferable adding amount of V in the invention is 0.01-0.06%. The wire rod for producing the ultrahigh-strength steel strand comprises the following chemical components in percentage by mass: c: 0.80% -0.95%, Si: 0.70% -1.00%, Mn: 0.50-0.90%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, V: 0.01-0.06%, Cr: 0.15 to 0.30 percent, and the balance of Fe and inevitable impurities.
According to the above designed components, the inventor also bases on the production process flow of the steel for the ultra-high strength steel strand which is commonly adopted at present: the production process of the invention is obtained by adjusting and optimizing process parameters, which comprises the following steps of molten iron pretreatment, converter refining, VD vacuum treatment, continuous casting, cogging and rolling, and comprises the following steps:
the condition of molten iron fed into the furnace after the molten iron pretreatment meets Si: 0.3-0.7%, S is less than or equal to 0.015%, P is less than or equal to 0.120%, Ti is less than or equal to 0.10%, and T is more than or equal to 1250 ℃. The amount of slag should not exceed 0.5%. The converter adopts a high carbon-drawing process, the steel-tapping end-point components C are more than or equal to 0.15%, P is less than or equal to 0.020%, S is less than or equal to 0.015%, T: 1610 to 1630 ℃. The converter tapping alloying adds the sequential low-nitrogen carburant + ferrosilicon + silicomanganese (ferromanganese). Refining and adjusting the argon flow, and controlling the diameter of the blow-off area to be about 300-400 mm. The whole refining process ensures that the atmosphere in the ladle is a reducing atmosphere, and the heating process slightly smokes. VD vacuum degree is less than or equal to 0.10KPa, target value is less than or equal to 0.06KPa, deep vacuum time is more than or equal to 15min, silicon-calcium line is fed after vacuum breaking, soft blowing is controlled for more than 15min, and no bare molten steel is obtained in the soft blowing process. The continuous casting covering agent uses carbonized rice hulls or low-alkalinity covering agents, and centering confirmation needs to be carried out on a crystallizer, a foot roller and a fan-shaped segment roller before production. The superheat degree is controlled to control the temperature of a 1 st furnace to be 35-55 ℃, and the tundish temperature of the 2 nd and later furnaces is controlled to be 20-30 ℃. The casting furnace 1 is controlled at the pulling speed of 0.4m/min, and the constant pulling speed casting is carried out for the rest furnaces, wherein the target is controlled at 0.65 m/min.
The ultra-high strength steel strand is rolled by high-carbon, high-silicon and low-manganese wire rods, and high-pressure water is started for descaling, so that the working pressure of descaling water and the smoothness of a water nozzle are ensured. The descaling water pressure is required to be more than or equal to 10MPa, and the scale on the surface of the billet is completely removed. The heating temperature of the heating furnace is controlled as follows: preheating 700 +/-20 ℃, heating section 1100 +/-20 ℃, soaking section 1150 +/-20 ℃, and residual oxygen is controlled at 1-4%, so that decarburization tendency is reduced, meanwhile, the temperatures of the heating section and the soaking section are increased, diffusion of C and alloy atoms is enhanced, center segregation degree is reduced, and yield and product quality are improved. The heating time is 105 +/-5 min, and the initial rolling temperature is 1020 +/-15 ℃. In the 22-pass continuous rolling procedure, the finish rolling inlet temperature is 910 +/-20 ℃, the spinning temperature is 920 +/-10 ℃, the spinning temperature is increased, the austenite grain size before phase change is further increased, the hardenability in the phase change process is enhanced, and the tensile strength of the wire rod is favorably improved. In the stelmor cooling process, in order to reduce the strength difference of the same circle and accelerate the cooling speed of the wire rod, the starting roller speed is 0.76m/s, 10 fans are totally arranged, the opening degree of 1-6 fans is 100%, 7 fans are closed, the opening degree of 8 fans is 50%, the opening degree of 9-10 fans is 100%, and the heat-insulating cover is fully opened. Finally, the wire rod for the ultrahigh-strength steel strand is prepared, wherein the diameter of the wire rod is 14mm, the tensile strength Rm is 1350-1430MPa, and the reduction of area Z is 25-35%.
The present invention will be described in detail with reference to specific examples.
Examples
The chemical compositions of the wire rods for the ultra-high strength steel strands of the examples are shown in table 1.
The production process comprises the following steps: molten iron pretreatment, converter, refining, VD vacuum treatment and continuous casting.
Pretreating molten iron: and desulfurizing the molten iron for the converter by adopting a KR method, stirring the molten iron by adopting a stirring paddle with the rotating speed of 90r/min, and adding a desulfurizing agent after stirring for 2min, wherein the desulfurizing agent is 9: 1, stirring and reacting the mixed lime powder and fluorite for 10min, and standing for 5 min. The desulfurization effect is stabilized by removing the desulfurization slag after the molten iron is desulfurized and left standing, the desulfurization slag is prevented from entering the converter to cause the resulfurization of the converter, and the Si in the molten iron is pretreated: 0.3-0.7%, S is less than or equal to 0.015%, P is less than or equal to 0.120%, Ti is less than or equal to 0.10%, and T is more than or equal to 1250 ℃.
Converter: the top-bottom combined blowing is adopted for decarburization and dephosphorization, the steel is smelted at 1650 ℃ until the carbon content in the molten steel is not lower than 0.15 percent and the phosphorus content is lower than 0.01 percent, protective gas is adopted to stir the molten steel at the pressure of 0.5MPa in the tapping process, ferrosilicon and silicomanganese alloy are added for deoxidation when the steel is tapped to 1/4, carbon powder and slagging material are added, and slag is blocked during tapping to prevent a large amount of slag from being discharged.
Refining: the method comprises the following steps of refining outside an LF furnace, deoxidizing at 1575 ℃ until the oxygen content in molten steel is 0.002%, adding ferromanganese, ferrosilicon, ferrochromium and ferrovanadium alloy elements, performing aluminum-free deoxidation in the refining, adding quartz sand and small ash during heating, adding ferrosilicon powder according to the conditions of fixed oxygen and furnace slag, spraying the deoxidizer on the surface of the slag, dipping a sample after the next heating is stopped, observing the color of the slag, and if transparent glass slag is used, determining that white slag is well produced, otherwise, continuously spraying the deoxidizer.
VD vacuum treatment: the actual VD vacuum degree is controlled to be 0.06KPa, the deep vacuum time is 18min, a calcium silicon wire is fed after the vacuum is broken, the soft blowing time is controlled to be 19min by soft blowing, and the molten steel is not exposed in the soft blowing process.
Continuous casting: drawing steel at a constant drawing speed as far as possible, wherein the drawing speed is controlled to be 0.65m/min, the section of a casting blank is 280mm and 380mm, and the length of the casting blank is 9.0 m. The casting blank has good control on the external dimension and the surface quality, and has no defects of stripping, scabbing, connecting marks, slag inclusion, sinking and the like.
The heating temperature of the rolling heating furnace is controlled as follows: preheating at 700 + -20 deg.C, heating at 1100 + -20 deg.C, soaking at 1150 + -20 deg.C, controlling residual oxygen at 1% -4%, and heating for 105 + -5 min. The initial rolling temperature is 1020 +/-15 ℃, the finish rolling inlet temperature is 910 +/-20 ℃, the starting roller speed is 0.76m/s, the opening degrees of 1-6 fans are 100%, 7 fans are closed, the opening degrees of 8 fans are 50%, the opening degrees of 9-10 fans are 100%, and the heat-insulating cover is fully opened.
The mechanical properties of the rolled coil are tested after 30 days of aging, and the specific test results are shown in table 2. The organization and performance index of the ultra-high strength steel strand wire rod can meet the use requirements of users, the mechanical property test results of the ultra-high strength steel strand wires after being drawn and used by users to form stranded wires are shown in table 3, the strength level of the steel strand wires is larger than 2000MPa, the highest strength can reach 2400MPa, and the strength of the existing steel strand wires is greatly improved.
Table 1: chemical composition of steel for super high strength steel strand%
Table 2: mechanical property test result of wire rod for ultrahigh-strength steel strand after aging
| Examples | Tensile strength/MPa | Face reduction ratio/%) | Sorbitizing rate/%) |
| Example 1 | 1358 | 28 | 93 |
| Example 2 | 1369 | 29 | 89 |
| Example 3 | 1406 | 32 | 95 |
| Example 4 | 1378 | 33 | 91 |
| Example 5 | 1368 | 35 | 90 |
| Example 6 | 1349 | 30 | 90 |
| Example 7 | 1332 | 29 | 89 |
Table 3: mechanical property test result of ultrahigh-strength steel strand
| Examples | Tensile strength/MPa | Elongation/percent |
| Example 1 | 2313 | 6.5 |
| Example 2 | 2306 | 5.5 |
| Example 3 | 2298 | 6.0 |
| Example 4 | 2321 | 6.0 |
| Example 5 | 2300 | 6.5 |
| Example 6 | 2295 | 5.0 |
| Example 7 | 2264 | 5.0 |
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The wire rod for the ultrahigh-strength steel strand is characterized by comprising the following chemical components in percentage by mass: c: 0.80% -0.95%, Si: 0.70% -1.00%, Mn: 0.50-0.90%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, V: 0.01-0.06%, Cr: 0.15 to 0.30 percent, and the balance of Fe and inevitable impurities.
2. The method for preparing the wire rod for the ultra-high strength steel strand as recited in claim 1, which comprises the following processes: the method comprises the following steps of molten iron pretreatment, converter refining, VD vacuum treatment, continuous casting, cogging and rolling, wherein:
after the molten iron pretreatment process, Si in the molten iron: 0.3-0.7 percent of S, less than or equal to 0.015 percent of P, less than or equal to 0.120 percent of P, less than or equal to 0.10 percent of Ti and more than or equal to 1250 ℃ of T;
the converter process adopts top-bottom combined blowing for decarburization and dephosphorization, and the steel is smelted at 1650 ℃ until the carbon content in the molten steel is not less than 0.15 percent and the phosphorus content is less than 0.01 percent, the steel end point component C is not less than 0.15 percent, P is not more than 0.020 percent, S is not more than 0.015 percent, and T: 1610 to 1630 ℃;
in the VD vacuum treatment process, the VD vacuum degree is less than or equal to 0.10KPa, the target value is less than or equal to 0.06KPa, the deep vacuum time is more than or equal to 15min, a calcium-silicon wire is fed after vacuum breaking, and the soft blowing time is controlled by soft blowing for more than 15 min;
in the continuous casting process, the superheat degree is controlled to control the temperature of a first furnace 1 to be opened to be 35-55 ℃, the tundish temperature in the second furnace and the later furnace is controlled to be 20-30 ℃, the casting furnace 1 is opened to be cast at the pulling speed of 0.4m/min, and the constant pulling speed of the other furnaces is controlled to be cast at the target of 0.65 m/min;
in the rolling process, the heating temperature of the rolling heating furnace is controlled as follows: preheating at 700 + -20 deg.C, heating at 1100 + -20 deg.C, soaking at 1150 + -20 deg.C, controlling residual oxygen at 1% -4%, and heating for 105 + -5 min; the initial rolling temperature is 1020 +/-15 ℃, the finish rolling inlet temperature is 910 +/-20 ℃, the starting roller speed is 0.76m/s, the opening degrees of 1-6 fans are 100%, 7 fans are closed, the opening degrees of 8 fans are 50%, the opening degrees of 9-10 fans are 100%, and the heat-insulating cover is fully opened.
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| CN113600623A (en) * | 2021-08-06 | 2021-11-05 | 新疆八一钢铁股份有限公司 | Method for inhibiting high-carbon steel wire rod SWRH82B core net-shaped cementite |
| CN113652610A (en) * | 2021-08-17 | 2021-11-16 | 江苏联峰实业有限公司 | Ultrahigh-strength stranded wire rod for railway bridge and production process |
| CN113897544A (en) * | 2021-09-02 | 2022-01-07 | 包头钢铁（集团）有限责任公司 | Wire rod for rare earth high-strength high-toughness prestressed steel strand and smelting and rolling production method thereof |
| CN114107837A (en) * | 2021-10-30 | 2022-03-01 | 天津荣程联合金属制品有限公司 | High-strength steel strand and production method thereof |
| CN114150221A (en) * | 2021-11-26 | 2022-03-08 | 湖南华菱湘潭钢铁有限公司 | Production method of ultra-high strength steel 82B |
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Application publication date: 20201124 |